Hello,
I have an older 3 family home. Recently several ceiling lights on a single circuit stopped working. We tried replacing switches, but did not correct the problem. Also there is a light on the circuit that still works so its not the breaker. Not completely familiar with what other outlets/ fixtures are on that circuit. Could it be a bad outlet? Or a poorly wired ceiling fixture? It's possible that all the lights are daisy chained.
Thanks,
Jen

Since the breaker is working, there is simply a loose or corroded connection or splice somewhere in the circuit, and can be any splice at any light, switch, receptacle, or junction box.